Mechanical movement.



R. F. SEGERBERG.

MECHANICAL MOVEMENT.

APPLICATION mm DEC-22. 1916.

3. 25 51% Patented May 8, 1917.

IN VE/VTOR ATIORNEYS ROLF F. SEGERBERG, OF NEl/V BRITAIN, CONNECTICUT.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Patented May 19153 Application filed December 22, 1916. Serial No. 138,400.

T 0 all whom it may concern:

Be it known that l, F. Successes, a citizen O'i the United States, and a resident of New Britain, in the county of Hartford and State of Connecticut, have inveiited a new and Improved lviechanical hiiovcinent, of which the following is a full, clear, and exact description.

it y invention relates to a. mechanical movement particularly adaptable for coupling and uncoupling machine elements; and it is characterized by the provision of a pair of relatively movable members each having recesses in which a key floats, said key being adapted to limit or predetermine the relative movement oi? the movable members and lock themto one another at the limits of their movement.

An object of the invention is to provide a simple, inexpensive and ellicient device particularly adaptable for coupling machine elements, while leaving to the elements a predetermined relative movement.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combina tion and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a diagrammatic elevation of the mechanical movement in one of its locked positions;

Fig. 2 is a similar view showing the two members in a different locked position or moved relatively through the distance determined by the key and recesses in the relatively movable members;

Fig. 3 is an elevation of two concentric sleeves the relative motion of which is con trolled by a floating key in a manner similar to that shown in Figs. 1 and 2;

Fig. 4. is a cross section on line l-d, Fig. 3;

Fig. 5 shows the relation of the sleeve when displaced through the distance limited by the movement of the key in the recesses;

Fig. 6 is a cross section on line 6-6, Fig. 5; and

Fig. 7 is a longitudinal section of a coaster brake provided with an embodiment of my invention, certain parts thereof being shown in elevation and certain parts being broken away to better illustrate the details oi? construction.

Before proceeding to a more detailed description of the invention, it must be clearly nmlerstood that although the application of the mechanical movement is shown in connection with a coaster brake, it is by no means limited to it. Furthermore, although in all the views the recesses have been shown of substantially triai'igular form, the move ment is not limited to this shape of recess. Other shapes can be given when relative motions in dilierent directions are desirable.

teterring to the drawings, particularly to Figs. '1 and 2, 8 and 9 are a pair of relatively movable plates. The two plates have identical recesses 19 of substantially triangular shape, the corners of which are rounded. One side 11 of the recess is arcuated, the arcuated side being disposed transversely of the plate in which the recess is formed. The recesses may be said to be sectorial with rounded corners. The recesses in the plates are directed oppositely, that is, the arcuated sides of said recesses face each other.

A key 12, having rounded ends similar to the rounded corners of the triangular recesses and of a length substantially that of the straight sides ot the recesses, engages the two recesses simultaneously. Taking the recesses as sectorial, the key may be said to occupy a radial position with said recess. It will be noted that the ends of the key in either position, Figs. 1 or 2, are engaged in the rounded corners 13 of the recesses which are opposite the corresponding curved side 11 of the same recess.

It the plate 9 is moved bodily in the direction of the arrow A the key is caused to turn in the ends 13 of the recesses 10 thereby causing a longitudinal displacement of the plates. Assuming plate 8 to be stationary, plate 9 will be moved in the directi on of the arrow B until the position shown in Fig. 1 is reached. At this position the straight sides of the key will rest against the straight edges of the recesses and the plates will be locked against further relative movement in the direction of the arrow A. The reverse relative movement of the plates is self-evident from the preceding statement.

It will be noted that although the key 12 can float in either of the recesses, and it is floating in the recesses when the members -one position (see Fig. 5).

" sleeve.

provided with recesses are moved relatively to one another, the floating action of the key is prevented when the members are at the limits of their movement. This can be easily seen from Figs. 1 and If we imagine that the plates 8 and 9 are folded into concentric sleeves 1e and (see Figs. 3 to 6 inclusive), they would have a relative motion limited by the size of the recesses 16 formed therein and the key 17 engaged in the recesses. If the sleeve 14: is held stationary and the sleeve 15 is rotated, it will be displaced longitudinally in relation to the sleeve 1% a distance dependent upon the length of the key and the angle formed in the recesses by the straight sides thereof against which the key abuts. The recesses are preferably so arranged that the key is parallel to the common axis of the sleeves when the two sleeves are locked in lVhn they are locked in the other position the key is disposed at an angle to the axis (see Fig. 3).

In the application of the mechanical movement to a coaster brake, as shown in Fig. 7, 18 is the driver, which has a triangular or sectorial recess 19. A sleeve 20 is rotatably mounted on the driver. It has an identical recess 19 disposed with its arouated side opposite to the arcuated side of the recess 19. A key 21 is fitted. into the recesses in a manner as previously described. The key is retained in the recesses by an annular spring 22 which encompasses the The sleeve 20 is provided with a spring 23 which exerts sufficient drag on a hubshell 2 1 to overcome friction in the mechanical movement and operate the same.

The sleeve 20 has suitable means at the ends thereof for engaging at one end a member 26 forming part of the hubshell 24:, and at the other end a member 27 forming part of the braking mechanism 28.

Assuming the hubshell to be driven by the driver 18, the means 25 of the sleeve will then be engaged to the member 26 of the hubshell as shown in Fig. 7. It now, the driver 18 is retarded or stopped, the continued rotation of the hubshell 21- will en train sleeve 20 on account of the drag of spring 23 on said hubshell. The key 21 will act as a toggle between the corners of the recesses and force the sleeve 20 to the left, that is, out of engagement with the member 26 and into engagement with the member 27. The hubshell will be running free. Any backward rotation of the driver 18 will cause the operation of the braking mechanism 28. The key 21 will be in the position as shown in Fig. 6, preventing the sleeve 20 from movement to the right.

If the driver 18 is rotated faster than the hubshell 2 1, the sleeve 20 will tend to run at the speed of the hubshell, on account of the drag caused by the spring 23. The arouated ends of the recesses in driver and sleeve will act as cam surfaces on the ends of the sleeve in the manner as previously described and cause a displacement of the sleeve 20, thereby disengaging it from the member 27 and bringing it into engagement with the member 26.

The advantage of such a construction as described is the elimination of practically all end thrusts on the ball bearings of the coaster brake. This end thrust is considerable when the customary screw and nut is used for effecting the driving and braking. At both ends of the relative movement of the drive and sleeve, they are positively locked against further relative movement in the same direction by the key resting against the straight sides of the recesses of the two members. It is self evident that more than one key may be used if so desired; but this is unnecessary because when relative movements of the sleeve and drive take place the key need only exert just enough pressure to overcome the friction between these members. If the key is strong enough to resist the shear, and of the right proportions to prevent tipping, one key is suflicient, particularly when care is taken to make the key bear snugly against the sides of the recesses in the locking positions.

While I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is'merely illustrative and that such changes may be made as are within the scope of the appended claims.

I claim:

1. In a mechanical movement, a pair of relatively movable members each having an angular recess, and a key mounted to swing in each of the recesses about its ends and engage simultaneously the facing sides of the two recesses when looking the relative movement of said members.

2. In a mechanical movement, a pair of relatively movable members each having a sectorial recess with rounded corners, a key adapted to be disposed radially and float in the recesses, said key adapted to engage opposite sides of said recesses when locking said members at the limits of their relative displacement.

3. In a mechanical movement, a pair of relatively movable members each having a sectorial recess, and a key mounted to float in the recesses and adapted to engage opposite sides of said recesses when looking the said members.

41. In a mechanical movement, a pair of relatively movable members having identi cal triangular recesses with rounded corners, one side of each of the recesses being arcuated, the arcuated sides of the recesses being opposite to each other, and a key adapted to float in each of the recesses and engage the opposite straight sides of the recesses for locking said members together at the ends of their relative movement.

5. In a mechanical movement, a pair of revoluble members having identical sectorial recesses With rounded corners, and a key adapted to float in each of the recesses and engage the opposite radial sides of the recesses for limiting the relative rotary and longitudinal displacement of said members.

6. In a mechanical movement, a pair of concentric revoluble members, said. members having identical sectorial recesses disposed so that the arcuated sides thereof face each other, and a key adapted to be disposed radially in said recesses and engage simultaneously the two recesses whereby the opposite radial sides of the recesses are adapted to engage the key and limit the relative rotary and longitudinal displacement of said concentric members.

7. In a. mechanical movement, a pair of revoluble concentric members, each of said members having a sectorial recess with rounded corners, the arcuated sides of the said recesses facing, each other, and a key having rounded corners adapted to be disposed radially in said recesses, said key being free to float in each of the recesses but adapted to engage the opposite radial sides of the recesses to limit the relative rotary and longitudinal displacement of said members.

8. In a coaster brake, a driver, a driven member, a sleeve revolubly mounted on the driver, said sleeve and driver having sectorial recesses With rounded corners, the arcuated sides of the recesses facing each other, a prismatic key having rounded corners fitting radially into said recesses, means for coupling the sleeve yieldingly to the driven member, and a braking mechanism associated With the driven member, said sleeve and driven member having coupling means adapted to cooperate When the key engages one pair of the facing radial sides or the recess, said sleeve and braking mechanism having coupling means becoming operative When the key engages the other pair of opposite radial sides of the recesses.

9. In a mechanical movement, a pair of members each having an angular recess and a key adapted to move Within the recesses so as to impart a compounded movement to said members, said key adapted to engage the facing sides of the recesses When coupling the two members.

ROLF F. SEGERBERG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

